fix about:memory and memory histograms to show extensions more clearly

chrome/browser/renderer_host/render_view_host.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 134 matching lines @@
   // for the onbeforeunload handler, so this function might buffer the message
   // rather than sending it.
   void Navigate(const ViewMsg_Navigate_Params& message);
 
   // Load the specified URL, this is a shortcut for Navigate().
   void NavigateToURL(const GURL& url);
 
   // Returns whether navigation messages are currently suspended for this
   // RenderViewHost.  Only true during a cross-site navigation, while waiting
   // for the onbeforeunload handler.
-  bool are_navigations_suspended() { return navigations_suspended_; }
+  bool are_navigations_suspended() const { return navigations_suspended_; }
 
   // Suspends (or unsuspends) any navigation messages from being sent from this
   // RenderViewHost.  This is called when a pending RenderViewHost is created
   // for a cross-site navigation, because we must suspend any navigations until
   // we hear back from the old renderer's onbeforeunload handler.  Note that it
   // is important that only one navigation event happen after calling this
   // method with |suspend| equal to true.  If |suspend| is false and there is
   // a suspended_nav_message_, this will send the message.  This function
   // should only be called to toggle the state; callers should check
   // are_navigations_suspended() first.
@@ skipping 176 matching lines @@
   // Notifies the renderer that we're done with the drag and drop operation.
   // This allows the renderer to reset some state.
   void DragSourceSystemDragEnded();
 
   // Tell the render view to enable a set of javascript bindings. The argument
   // should be a combination of values from BindingsPolicy.
   void AllowBindings(int binding_flags);
 
   // Returns a bitwise OR of bindings types that have been enabled for this
   // RenderView. See BindingsPolicy for details.
-  int enabled_bindings() { return enabled_bindings_; }
+  int enabled_bindings() const { return enabled_bindings_; }
 
   // See variable comment.
-  bool is_extension_process() { return is_extension_process_; }
+  bool is_extension_process() const { return is_extension_process_; }
   void set_is_extension_process(bool is_extension_process) {
     is_extension_process_ = is_extension_process;
   }
 
   // Sets a property with the given name and value on the DOM UI binding object.
   // Must call AllowDOMUIBindings() on this renderer first.
   void SetDOMUIProperty(const std::string& name, const std::string& value);
 
   // Tells the renderer view to focus the first (last if reverse is true) node.
   void SetInitialFocus(bool reverse);
@@ skipping 464 matching lines @@
   // The most recently received accessibility tree - for unit testing only.
   webkit_glue::WebAccessibility accessibility_tree_;
 
   // The termination status of the last render view that terminated.
   base::TerminationStatus render_view_termination_status_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewHost);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_H_